In order to cut the 3 5/16″ square position edge of the fabric half way between the 3 1/4″ and 3 3/8″ marks on the ruler.

With the 3″ squares make half square triangle units using one of the previous methods. Cut them apart between the two seams and press toward the dark fabric. Trim all four units into 2 1/2″ squares, using the 45 degree line on your ruler.

Add two of the triangles cut from the 2 7/8″ squares to either side of the half square triangle unit as shown below.

Press and trim so one edge lies along the 45 degree line and the tip of the triangle is on the 3 1/2″ line.

Place this unit on top of the triangle cut from the 4 7/8″ square and carefully sew with a 1/4″ seam allowance.

If unit you made isn’t perfect you can lay it on top of the 4 7/8″ triangle and use that for the guide. You can see the triangle on the left isn’t exactly right. I made sure all the points matched and then used the brown triangle as my guide for my 1/4″ seam allowance.

Make four units using the 2 1/2″ x 4 1/2″ pieces as shown below.

For the center block lay the long edge of two of the triangles cut from the 2 7/8″ squares on either side of the 3 5/16″ neutral square. Stitch on a 1/4″ seam allowance.